[单选题]交换机工作在OSI七层模型的哪一层()

正确答案 ：B

数据链路层

[单选题]下面有关交换机的描述中，正确的是（）

正确答案 ：C

交换机独占带宽

[单选题]两台路由器直连到一起，应该使用的线缆为（）

正确答案 ：A

交叉线缆

[单选题]After working on a router, some problems arise and you wish to view the commands that you recently entered. Which IOS command opens the history buffer and displays the most recently entered commands?

正确答案 ：A

Show history

解析：A 解析：Explanation:

[单选题]Given that you have a class B IP address network range, which of the subnet masks below will allow for 100 subnets with 500 usable host addresses per subnet?

正确答案 ：C

255.255.254.0

解析：解析：Explanation:

[单选题]What is the purpose of the Spanning Tree Protocol (STP)?

正确答案 ：D

To maintain a loop-free Layer 2 network topology

解析：解析：Explanation:

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